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Finding the Fourth Proportional to 20,791.94, 31,200.88 and 8,310.02

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Solution

The fourth proportional to 20,791.94, 31,200.88 and 8,310.02 is: 12,470.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.94 : 31,200.88 = 8,310.02 : x
  2. Step 2: Convert to fraction form
    20,791.94/31,200.88 = 8,310.02/x
  3. Step 3: Cross multiply
    20,791.94x = 31,200.88 × 8,310.02
  4. Step 4: Simplify right side
    20,791.94x = 259,279,936.82
  5. Step 5: Solve for x
    x = 259,279,936.82/20,791.94
  6. Step 6: Final answer
    x = 12,470.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.